tamerlan later died after a shootout with police. in providence, rhode island, lawyers for tamerlan tsarnaev's wife catherine said she had been unaware of the bombing plot. >> the reports of involvement by her husband and brother-in-law came as an absolute shock to them all. as a mother, a sister, a daughter, a wife, katie deeply mourns the pain and loss to innocent victims, students, law enforcement officers, families and our community. in the aftermath of this tragedy she, her daughter and her family are trying to come to terms with this event. >> woodruff: meanwhile, both the "washington post" and the "new york times" have reported that the younger tsarnaev admitted his role in the attack. the "post" also reported he told investigators that u.s. involvement in the iraq and afghanistan wars were motivating factors. other accounts said there appeared to be no links to larger terrorist groups. in russia today, their mother said f.b.i. agents talked to her about tamerlan tsarnaev's trip back home last year, but she told them he was no